STFPC320 STMicroelectronics, STFPC320 Datasheet - Page 17

• Manufacturer Part Number: STFPC320
• Description: Front Panel Controller/driver With Standby Power Management And Real-time Clock
• Manufacturer: STMicroelectronics

STFPC320
4.14
Initial state
On power application, the 1/16-pulse width is set and the display shows the value
configured in the VFD display RAM before entering the standby mode. Thus if HELLO is
required to be shown on the VFD upon wake-up, then the user must write the corresponding
digit and segments locations in the VFD display memory before going into the standby mode
of operation. Note that the VSS must be present in order to keep the VFD display active.
The value of the display changes only after user configuration.
If the user wishes to display the RTC value during standby, then the user must configure the
STFPC320 by sending the appropriate command. If the user does not configure the
STFPC320 to display the RTC in standby, the VFD shows the same value as was written in
the VFD display memory location.
Note that all the hot keys are disabled on power-up. Only the hot-keys (FP or RC) or RTC or
the low to high transition on the PIN_AV8 pin can be detected to wake-up the system from
standby condition.
Functional description
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